These 6 Stocks Make Up a Big Share of the S&P 500

Six tech giants—Nvidia, Microsoft, Apple, Amazon, Alphabet, and Meta—comprise 30.8% of the S&P 500 as of November 2026. While these companies have driven significant AI-related spending and capital investments, their performance varies widely. Alphabet has emerged as the strongest performer with 63% gains over two years, while Meta lags with only 7% growth. The index continues to concentrate among mega-cap tech stocks, with the top 10 companies now accounting for 39% of total weight.